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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0786288968b034ebba82a63c6f8847f40cca178db300ed270ddf18f9706a98' 
  AND token = '7yo4vV0yUgzcSH+j9qa6BKuU8ZTHpDekA767QK4ZVP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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