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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c64ce6ca3ed23309539b3cf865b32a411dd884b35fed007a5d50e30e811432' 
  AND token = 'ijRkV0og2Fb2sFfxvORMyLd5vRA+pIOIovTqJM06oHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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