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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2266a968dbdc07a47137ec214afcbcad60cdfba89380bbc1b01f3fc97f9ca8ba' 
  AND token = 'PygebrAmpvbhhHTJmJ93B5Q6IhTRQNKRDuVnO58kBVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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