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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0668fd8447995bfa04aa5d32aa6ba3c283298acbcf92f3ac04f65ac9d0430c26' 
  AND token = 'BfMF9JUltz+8Psfb+XYhyp2jI8vqgcykFe9fy909E7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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