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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f15f42fe55cbe05252fadfd20ea5d1a49883484fa27974c542cd5e71d5911b' 
  AND token = 'LFG/kqPLMBPIV30YR41vLfR2mdu2Edx9iABOyt4LyVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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