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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8428ab2f4beee94ddc4e58a712b77dd3e43abad093e330bcdc7130de11dbd5f4' 
  AND token = 'FfQ5r9HVPrBkbO5o3eq+jh7gy9gjitDn14BEZba52qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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