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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51e969ef9f2ce8d84e67d882ba34c1ee3fcb5862c62a508227709fc0860e96c' 
  AND token = 'yMo4bDodMMybYjb4akelBGb2mkcKil1DHO/q70GVIFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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