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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97a5eec32a8e05b9c23bccbae2409859810c51d7ac4e420668416830ff04b8a' 
  AND token = 'N2vGtCQqyEIWHfmkVE16Pf6VCta6P2++9/Ayn+p+Bjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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