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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3379c9e6cd382eec3aadb69a51a685186f278f96e89c74075ad1f8cd43a660b8' 
  AND token = 'J8vPmLoFmwRek+RW28ZbeuGkmODEYs/DfZWqlc1nS/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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