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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b547141c40081ded7b63cd3bd9687480b1bfcef52de8c3f27af6235b9649b799' 
  AND token = 'q2lwJn5iRkIIQPTluHe1k+FhVJWTqFQ/s4xxDd27I1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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