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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c067d0b903273ebe4d58957acef50b53d13d3199538fc6aab8f39bcdac9298f5' 
  AND token = 'C9SV6It2tDkEekAfj+O1QqSn5Wq2licahGlT7fSAo64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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