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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3a9dfffa610fa6f39d14fd795807aac9943709199f5f6df374c9f3c2886b31' 
  AND token = '+Qmsq0CGHbxRy9hXDqOzU+MzIQPugRFbLNE6elHMMoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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