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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5eff493fb6a7e6de17a2a22d4d7ce025077dfd84a31c55044b5a5774c1982c' 
  AND token = 'RTkSX2u2h4jY4rPAqxXXSuzCgAyHjF0fbqVfj/gQZeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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