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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90336df5013b4b7736fe263dd386f9496a29b85a92d607286d1e4be1f3f5e0b1' 
  AND token = 'xCfcK5RTLlJ/OnB27baOjogbkkeCKs0fnQ7qz/JRolM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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