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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe362a31f41dc120622e38b03719648baee873a34905dc50dc3e4048feae85b' 
  AND token = 'GZ56DAk4UaH3sFN+Y5jV/GzNsCP3LdrHo4UYjQxT3Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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