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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e900c7386c11f820104e5c7e9815c406fe4b0a07bde187ae54cc5a64ff2bd1' 
  AND token = 'Lszt2lGdMr/MI1wrZ+X86wK/ojiB81NL2wgaG8GbxqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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