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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a034b64453ba69be057d10b9d57891daf5ea798b142dcc146fa42576f9ed64a4' 
  AND token = 'KtksD1EtIj2LMAM/BaF5BDOep+I4+Y1wnhlMlCMm7SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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