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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38bb6788d1bb5fde2f500a2a06c2a82a7083db077489ad326812d2bbe96eb2a' 
  AND token = '+JPd30/q9QP4+f7z2aypahhK/Mj407rR4l8C+cYsk6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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