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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ea3d62c144bb5bde5d59a47a88ae23794feb78494722c7a628e4042edef223' 
  AND token = 'SPWUD3cKw9PF6h1kwFH/CAItankIghgBDFe9rexxvNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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