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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb94f07c0645830c4c41b1027e50136e51752f046625c4fecb25b444d14ae3c7' 
  AND token = '/iHIIyz9jKWq9FEbS/qNPD/vxuT77ff2HyLyBV8yDrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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