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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56fc89f3fc3a9fa053ff38c06f9aca79306b2a5116180f6cc82e8328fa77c9a' 
  AND token = 'Kb7I7Pq1p8pMBXYAYFHaiAT06clJHkkx30h6R0M3bHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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