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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddc010e623b5629fd51d672a9241f17fecbb72e3a1a99328cb85461fb02ab4d' 
  AND token = 'uG1w8o7L2LfK1HC3cG9vVPMZ7W+mHcuN+A/Srn+EL5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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