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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ad56297710c4aac49127ad4f99e0ad87beae920f9ff4b35eeb4916ff970f1d' 
  AND token = 'G4oTtj/cvw6dlJA3Oc4Vmb9a6eU4Mx5WOhl6KWijXLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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