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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349b5d795859648d08f027396d708231ea891731762d9d4d4d2f207333cb2dd9' 
  AND token = 'gEmMdrzlr0YtJ46N7ukZXamm5Nl63+dL1dRONUf6Pd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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