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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663983b3850db54b9e3dbc2a0a8161f2b7961a5d37772a11937adc7934c03867' 
  AND token = 'P+RDCc3F3n4XvSYMkFsgDD0n+kgje23Cr75U9IZdyHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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