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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11bcbd74850017cf2dd7ecea15e437b9d22b63bb0d3b281e79b1eb62559c5eb' 
  AND token = '6qJOSaIKCsQWYp1viVSwReOy6roX3sDbnz44+Zvw37g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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