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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31dff35438393734f4e5b1fe0f2e37d5961bbd6d3a659bd1f50873462ec475c' 
  AND token = 'B8U90+6t2L8jpQWLQ376kEhHFpbPtOAPm40eZPVy3fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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