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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce775a2260ab8170b673714e1bff3f8bb4075cc491af0e183ddcdfba071b7130' 
  AND token = '+9do8qRYALph7kacV2J2NLT5IFhLL9sIKtxvvi/f2ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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