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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d77dd94eaacc14697fd18c95c55f456792a0cc7d3974db6eb64f209e668974' 
  AND token = 'ZK4gGJhlhvmkKi1T4FJW7DIL1/esce/IlnTPWfSfpA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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