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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ab8c12be669c8f96df033e15b43e37f40ad47d54caffeebc95f2a8a1b10639' 
  AND token = 'Prcn3Gy6d41EsgrSvbXNhh8iQ2SB+OVBXXDdARxxMtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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