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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2dc4c7bc150ee2edf9890feb71d9a4090f65564481d02d6627ee7ea7a5dc25' 
  AND token = 'OlVMzXghC20bs2rNg2HdqOKyQWg7THhCFb0omR3+2d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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