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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc05f6bbb35da1f047325b8130d6959fc437f1ff7095c36d2f2b1611942e555' 
  AND token = 'g6RtN1xj860YgKpf0Wn+/MbgsCPxUs2SIQ7eBzZAfEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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