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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cd4fa0a5c17cb926b32be8916c73682acd3ee67745921508ecf116118c5dae' 
  AND token = 'lO8fIGk+JDNIGiAkqfe7tdT+4rF/hY23DS2DgrakmeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}